Summary For auditory integration (AI) therapy, the largest body of literature relates to its use in autism. Several systematic reviews of AI therapy in the treatment of autism found limited evidence to support its use. No comparative studies were identified that evaluated the use of AI therapy for other conditions.
The actual cost to install a gas fireplace may vary depending on your location, the product selected, complexity of the installation process, additional accessories purchased, and other options. 1  Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
If you are looking at natural gas fireplace inserts, then around $800 is a relatively low price for a very basic unit. The more full-featured models can easily cost $4,000 or more, with an average price range falling between $1,200 and $2,000.ost masonry fireplaces cost $5,000 or more due to the labor required to install each individual brick or stone within your home. A masonry heater (a very large stone stove) can cost upwards of $20,000 because of the tremendous amount of custom work that is required.